U.S. patent number 9,422,699 [Application Number 13/884,847] was granted by the patent office on 2016-08-23 for toilet inlet valve and control method thereof.
This patent grant is currently assigned to WDI (XIAMEN) TECHNOLOGY INC.. The grantee listed for this patent is Feiyu Li, Yuzhi Liu, Dongsheng Yao. Invention is credited to Feiyu Li, Yuzhi Liu, Dongsheng Yao.
United States Patent |
9,422,699 |
Li , et al. |
August 23, 2016 |
Toilet inlet valve and control method thereof
Abstract
A toilet inlet valve and control method thereof, the inlet valve
comprises a valve body, an inlet pipe, a water stop device with a
water stop rubber gasket, a float bowl device, a raising rod device
and an outlet pipe, wherein, the water stop device also comprises a
water stop seat, a tray, a needle valve and a back pressure cavity;
the water stop seat is located at the front end of the outlet pipe,
and of which the opening is coupling with the end face of the water
stop rubber gasket; the tray is connected to the water stop rubber
gasket, and is located at the side of the water stop seat that is
opposite to the water stop rubber gasket; the needle valve is fixed
to the tray, and is located at the side of the water stop rubber
gasket that is opposite to the tray.
Inventors: |
Li; Feiyu (Xiamen,
CN), Yao; Dongsheng (Xiamen, CN), Liu;
Yuzhi (Xiamen, CN) |
Applicant: |
Name |
City |
State |
Country |
Type |
Li; Feiyu
Yao; Dongsheng
Liu; Yuzhi |
Xiamen
Xiamen
Xiamen |
N/A
N/A
N/A |
CN
CN
CN |
|
|
Assignee: |
WDI (XIAMEN) TECHNOLOGY INC.
(Xiamen, CN)
|
Family
ID: |
46050405 |
Appl.
No.: |
13/884,847 |
Filed: |
November 7, 2011 |
PCT
Filed: |
November 07, 2011 |
PCT No.: |
PCT/CN2011/081849 |
371(c)(1),(2),(4) Date: |
May 10, 2013 |
PCT
Pub. No.: |
WO2012/062189 |
PCT
Pub. Date: |
May 18, 2012 |
Prior Publication Data
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|
|
Document
Identifier |
Publication Date |
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US 20130228238 A1 |
Sep 5, 2013 |
|
Foreign Application Priority Data
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|
|
|
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Nov 11, 2010 [CN] |
|
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2010 1 0541742 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
E03D
1/32 (20130101); F16K 31/22 (20130101); F16K
31/34 (20130101); F16K 21/18 (20130101); Y10T
137/7442 (20150401); Y10T 137/0318 (20150401) |
Current International
Class: |
F16K
31/18 (20060101); F16K 31/34 (20060101); F16K
21/18 (20060101); E03D 1/32 (20060101); F16K
31/22 (20060101) |
Field of
Search: |
;137/413,414,437,441-444,451,484.8,485-492.5 ;251/25-47 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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|
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2421475 |
|
Feb 2001 |
|
CN |
|
2694075 |
|
Apr 2005 |
|
CN |
|
2755374 |
|
Feb 2006 |
|
CN |
|
2931970 |
|
Aug 2007 |
|
CN |
|
2937690 |
|
Aug 2007 |
|
CN |
|
2181454 |
|
Apr 2002 |
|
RU |
|
Primary Examiner: Murphy; Kevin
Assistant Examiner: Do; Hailey K
Attorney, Agent or Firm: Rabin & Berdo, P.C.
Claims
What is claimed is:
1. A toilet inlet valve, comprising a valve body, an inlet pipe, a
water stop device with a water stop rubber gasket, a float bowl
device, a raising rod device and an outlet pipe, wherein, the water
stop device also comprises: a water stop seat, which is located at
a front end of the outlet pipe, and of which an opening is coupling
with an end face of the water stop rubber gasket; a tray, which is
connected to the water stop rubber gasket, and is located at a side
of the water stop rubber gasket that is opposite to the water stop
seat; a needle valve, which is fixed to the tray, and is located at
a side of the tray that is opposite to the water stop rubber
gasket; a back pressure cavity, which is a cavity with a discharge
hole, containing the tray and the needle valve, and is provided
with a needle valve hole sleeved around the needle valve; water is
divided into two ways by an inlet pipe valve body, one way is a dry
way, and another way is a control branch; the dry way: water in
this way enters a fluid cavity of the inlet pipe, and reaches the
water stop rubber gasket, and then a reverse water pressure is
generated, in an opposite direction to a water flow direction in
the inlet pipe; the control branch: water in this way passes
through a gap between the needle valve and the needle valve hole,
and then reaches the back pressure cavity containing a needle valve
cover, and then a downstream water pressure to the tray is
generated, in a same direction as the water flow direction in the
inlet pipe.
2. A toilet inlet valve according to claim 1, wherein, the shape of
the tray is bowl-shaped, of which the outer surface is a
cylindrical surface.
3. A toilet inlet valve according to claim 1, wherein, a filter
with a filter screen is provided out of the needle valve hole.
4. A toilet inlet valve according to claim 3, wherein, an inlet of
the filter screen of the filter is downstream of the water flow
from the inlet pipe and the filter is aligned with the water flow
direction from the inlet pipe.
5. A toilet inlet valve according to claim 1, wherein, a coaxial
air bag cavity is provided outside of the inlet pipe, and the
bottom of the air bag cavity comprises a circular elastic air
bag.
6. A toilet inlet valve according to claim 5, wherein, the fluid
cavity on the bottom of the inlet pipe is provided with a rotary
structure.
7. A toilet inlet valve according to claim 1, wherein, the needle
valve is divided into two segments along its axial direction, which
are: a coupling segment, of which the cross section is coupling
with the needle valve hole; a gap segment, of which the cross
section is not coupling with the needle valve hole but provided
with clear gap.
8. A toilet inlet valve according to claim 7, wherein, the cross
section of the coupling segment of the needle valve is circular,
and the outer surface of the gap segment is provided with a
plurality of slots along the axial direction of the needle valve,
which extend to the tray.
9. A toilet inlet valve according to claim 8, wherein, the cross
section of the coupling segment of the needle valve is circular,
and that of the gap segment is also circular, and the diameter of
the cross section of the gap segment is shorter than the diameter
of the cross section of the coupling segment.
10. A toilet inlet valve comprising a valve body, an inlet pipe, a
water stop device, wherein, the water stop device also comprises: a
water stop seat, which is located at a front end of an outlet pipe,
and of which an opening is coupling with an end face of the water
stop rubber gasket; a tray, which is connected to the water stop
rubber gasket, and is located at a side of the water stop rubber
gasket that is opposite to the water stop seat; a needle valve,
which is fixed to the tray, and is located at a side of the tray
that is opposite to the water stop rubber gasket; a back pressure
cavity, which is a cavity with a discharge hole, containing the
tray and the needle valve, and is provided with a needle valve hole
sleeved around the needle valve; wherein water is divided into two
ways by an inlet pipe valve body, one way is a dry way, and another
way is a control branch; wherein in the dry way, water enters a
fluid cavity of the inlet pipe, reaches the water stop rubber
gasket, and then a reverse water pressure is generated, which is in
an opposite direction to a water flow direction in the inlet pipe;
wherein in the control branch, water passes through the gap between
the needle valve and a needle valve hole, and then reaches the back
pressure cavity containing a needle valve cover, and then a
downstream water pressure to the tray is generated, in a same
direction as the water flow direction in the inlet pipe; wherein
when the discharge opening is blocked, water flows into the back
pressure cavity through the inlet of the back pressure cavity, the
control branch that is formed by the gap between the needle valve
and the needle valve hole, the downstream water pressure to the
water stop rubber gasket in the back pressure cavity is bigger than
the reverse water pressure, and the water stop seat is blocked by
the water stop rubber gasket; wherein when the discharge opening is
opened, the stored water in the back pressure cavity flows out of
the discharge opening, and the downstream water pressure is
decreased; wherein when the intensity of water pressure to the
water stop rubber gasket in the back pressure cavity is smaller
than the reverse (outside) intensity of pressure, then the water
stop rubber gasket is opened.
11. A toilet inlet valve according to claim 10, wherein, the needle
valve is divided into two segments along its axial direction, which
are: a coupling segment, of which the cross section is coupling
with the needle valve hole; a gap segment, of which the cross
section is not coupling with the needle valve hole but provided
with clear gap; when the discharge opening is blocked, water from
the inlet pipe flows into the back pressure cavity through the gap
between the needle valve hole and the needle valve, the water in
the back pressure cavity starts to increase; and wherein during the
water increasing process, the needle valve is driven to move
reversely with respective to a first dynamic state, and the gap
segment and the coupling segment of the needle valve are present in
the needle valve hole successively, so that the inlet rate in the
back pressure cavity is decreased, and then the pressure increasing
rate in the back pressure cavity is decreased.
Description
FIELD OF THE INVENTION
The present invention relates to a flow valve, more particular to a
liquid level control valve for the water tank of toilet and
corresponding control method
BACKGROUND OF THE INVENTION
Level control valve with float bowl has been widely used in the
inlet control device of the flush toilet. This kind of valves uses
the buoyant force of the float bowl to control the inlet according
to the water level in the water tank, and supply water to the water
tank automatically. Wherein, the on and off of the valve are
controlled by the raising rod device, so that the vertical
displacement can control the mechanisms, such as the needle valve,
the tray, the water stop rubber gasket and so on.
Because this kind of valves are directly connected to the urban
domestic water pipe, the inlet pressure and stability are affected
by the whole water supply net, water flow may impact the valve when
the water pressure is too high or not stable enough, water flow may
impact the valve, because the level control valve uses a plurality
of linked mechanical structural members including the needle valve,
this impact may affect the longevity of these structural members at
different levels, and generates a lot of noise inevitably,
affecting the home or public environment. The applicant has gotten
an authorized proposal of needle valve CN2421475Y, which relates to
an inlet valve with needle valve, because the needle valve is
sleeved to the water stop rubber gasket in a moving manner, and the
water stop rubber gasket uses soft material, the gap of the needle
valve is unstable during the moving process controlled by water
pressure, and then noise and shake can be brought during the water
stop process, therefore, how to design a reliable, quite and more
human valve is to be a unsolved technical matter.
SUMMARY OF THE INVENTION
The present invention discloses a toilet inlet valve aiming at the
said lifetime of valve and noise problem, and the technical
proposal is:
A toilet inlet valve, comprises a valve body, an inlet pipe, a
water stop device with a water stop rubber gasket, a float bowl
device, a raising rod device and an outlet pipe, the water stop
device also comprises:
A water stop seat, which is located at the front end of the outlet
pipe, and of which the opening is coupling with the end face of the
water stop rubber gasket;
A tray, which is connected to the water stop rubber gasket, and is
located at the side of the water stop seat that is opposite to the
water stop rubber gasket;
A needle valve, which is fixed to the tray, and is located at the
side of the water stop rubber gasket that is opposite to the
tray;
A back pressure cavity, which is a cavity with a discharge hole,
containing the tray and the needle valve, and is provided with a
needle valve hole sleeving to the needle valve;
As another kind of similar proposal, it can done in the following
way:
A toilet inlet valve, comprises a valve body, an inlet pipe, a
water stop device with a water stop rubber gasket, a float bowl
device, a raising rod device and an outlet pipe, the water stop
device also comprises:
A water stop seat, which is located at the end of the inlet pipe,
and of which the opening is coupling with the end face of the water
stop rubber gasket;
A tray, which is connected to the water stop rubber gasket, and is
located at the side of the water stop seat that is opposite to the
water stop rubber gasket;
A needle valve, which is fixed to the tray, and is located at the
side of the water stop rubber gasket that is opposite to the
tray;
A back pressure cavity, which is a cavity with a discharge hole,
containing the tray and the needle valve, and is provided with a
needle valve hole sleeving to the needle valve;
As the preferred embodiment of the present proposal, several
improvements can be done in the following way:
In the two same kinds of proposals above, the needle valve is
divided into two segments along its axial direction, which are:
A coupling segment, of which the cross section is coupling with the
needle valve hole; and a gap segment, of which the cross section is
not coupling with the needle valve hole but provided with clear
gap. According to the two-segment-type of the needle valve, one
realization form is: the cross section of the coupling segment of
the needle valve is circular, and the outer surface of the gap
segment is provided with a plurality of slots along the axial
direction of the needle valve, which extend to the tray. Another
realization form is: the cross section of the coupling segment of
the needle valve is circular, and that of the gap segment is also
circular, and the diameter of the cross section of the gap segment
is shorter than the diameter of the cross section of the coupling
segment.
A filter with a filter screen is provided at the entrance of the
inlet water out of the needle valve hole. And the inlet of the
filter screen of the filter is designed to be vertically ahead the
vector direction of water flow from the inlet pipe.
In the first proposal, a coaxial air bag cavity is provided out of
the inlet pipe, and the bottom of the air bag cavity comprises a
circular elastic air bag.
In the first proposal, the fluid cavity on the bottom of the inlet
pipe is provided with a rotary structure.
In the two proposals above, the shape of the tray is bowl-shaped,
of which the outer surface is a cylindrical surface.
According to the two-segment-type structure of the needle valve,
the control method in the present invention comprises a steady
state and two dynamic states:
The steady state: the discharge opening is blocked, the back
pressure cavity is only provided with one inlet, namely the gap
between the needle valve and the needle valve hole; the back
pressure cavity is filled with water, the intensity of pressure of
the water pressure to the water stop rubber gasket in the back
pressure cavity is equal to the outside intensity of pressure, and
the water stop rubber gasket keeps still and blocks the water stop
seat, and the tray and the needle valve keep still relatively, and
the coupling segment of the needle valve is in the needle valve
hole;
The first dynamic state: on the basis of the steady state, the
discharge opening is opened, the stored water in the back pressure
cavity quickly flows out of the discharge opening, and in which the
intensity of pressure decreased quickly; and the intensity of
pressure of water pressure to the water stop rubber gasket in the
back pressure cavity is clearly smaller than the outside intensity
of pressure, the water stop rubber gasket is obligated by the
outside water pressure to retract ahead the back pressure cavity
along with the tray and the needle valve, and the coupling segment
of the needle valve is located in the needle valve hole first and
then the gap segment along with the increasing of the retracting
process; this first dynamic state can be summed up to be the
opening process of the water stop rubber gasket.
The second dynamic state: on the basis of the second dynamic state,
the discharge opening is blocked, because water in the inlet pipe
flows into the back pressure cavity through the gap between the
needle valve hole and the needle valve, water in the back pressure
cavity starts to increase; along with the water increasing process,
the pressure in the back pressure cavity increases, the water stop
rubber gasket is pushed to extend outward the back pressure cavity
by the tray, and the needle valve is driven to move opposite to the
first dynamic state in the needle valve hole, and then the gap
segment of the needle valve is located in the needle valve hole
first then the coupling segment, so that the inlet rate in the back
pressure cavity is reduced, and then the pressure increasing rate
in the back pressure cavity is reduced, and then the rate that the
water stop rubber gasket is opposed by the tray to block the water
stop sea is remitted; this second dynamic state can be summed up to
be the damping closing process of the water stop rubber gasket that
lasts until the steady state is present.
The benefits of the present invention are:
1 the tray and the needle valve is linked in a fixing manner, the
gap between the needle valve and the needle valve hole is the inlet
of the back pressure cavity that is at the opposite side of the
water stop rubber gasket and the tray and sleeved in the hard
needle valve hole in a moving manner, the inlet of the back
pressure cavity is far from the water stop component of the valve,
and the gap between the needle valve and the needle valve hole is
stable, so that the noise and the shake are deceased during
working.
2 because the two-segment-type structure, the needle valve is
provided with a damping closing process during the working cycle,
so that the impact and the shake caused by water stop are greatly
relieved, and then the gouging abrasion and working noise of the
components are decreased.
3 water enters the needle valve device is buffered and filtered
because of the filter screen of the filter and the transverse inlet
structure of the filter screen; the water pressure is relieved on
one hand, and on the other hand all kinds of solid impurity in
water flow because of the impact is filtered vertically and
flushed, so that the working of the needle valve is more stable and
safter.
4 the coaxial air bag cavity that is out of the inlet pipe offers
diffluent and decompressive effect to the fluid when water flows
into the whole valve.
5 the fluid cavity at the bottom of the inlet pipe is provided with
rotary structure to restrict the vector precession of water flow,
most of the impact energy in water flow is appropriately resolved
and absorbed by the vector precession water way, and the shake and
the noise caused by the impact is greatly avoided.
BRIEF DESCRIPTION OF THE DRAWINGS
With the following description of the drawings and specific
embodiments, the invention shall be further described in
details.
FIG. 1 shows the left view of the preferred embodiment 1 in the
present invention;
FIG. 2 shows the top view of FIG. 1;
FIG. 3 shows the partial sectional view of FIG. 1 along A-A;
FIG. 4 shows an exploded view of the present invention;
FIG. 5 shows the exploded view of the present invention from
another view;
FIG. 6 shows the partial sectional view of A part of FIGS. 4 and
5;
FIG. 7 shows the partial sectional view of B part of FIGS. 4 and
5;
FIG. 8 shows the partial sectional view of the main component of A
part of FIGS. 4 and 5 from another view;
FIG. 9 shows the proposal view that the needle valve with
groove-type gap segment is present, corresponding to the tray;
FIG. 10 shows the proposal view that the needle valve with
footstep-type gap segment is present, corresponding to the
tray;
FIG. 11 shows the sectional view of the embodiment 2 in the present
invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Embodiment 1
As shown in FIGS. 1, 2 and 3, the embodiment of the present
invention is shown, 1 is the valve body, the main components of the
water stop device is composed of the tray 2, the water stop rubber
gasket 3, needle valve 4 and needle valve cover 5, wherein the
needle valve cover 5 is also provided with a discharge hole 52; 6
is elastic air bag, 7 is filter, 8 is filter screen; 9 is screw
head, 10 is inlet pipe; 11 is raising rod, 12 is upper rubber
gasket, 121 is discharge opening, 13 is float bowl, 14 is outlet
pipe, 15 is adjusting rod, 16 is water stop seat; the direction of
water flow is shown by the arrow in the figures.
The internal structure of the valve body 1 is more clearly shown in
a solid exploded way in FIGS. 4, 5, 6, 7 and 8. In FIGS. 4 and 5,
the module A comprises the main components of the water stop
device, the module B comprises the main components of the inlet
pipe part. Wherein, the exploded view of FIG. 4 is shown in FIG. 6,
the main body part of the back pressure cavity is the needle valve
cover, the tray 2 is sleeved to one end of the gap segment of the
needle valve 4 in a fixing manner, the front end of the tray 2
passes through and is fixed to the top end of the water stop rubber
gasket 3; and the coupling segment of the needle valve 4 is
inserted into the needle valve hole 51 of the needle valve cover 5,
although the shapes are agreed with each other, free sliding and
non-liquid seal can be achieved. The relationship of the water stop
rubber gasket 3, the tray 2 and the needle valve 4 in module A is
shown from another view in FIG. 8; the exploded view of the module
B is shown in FIG. 7, the elastic air bag 6 is sleeved to the
bottom of the inlet pipe 10, and then the screw head 9 is sleeved
to the inlet pipe; the bottom of the inlet pipe 10 is provided with
a rotary fluid cavity 101.
FIGS. 9 and 10 show two kinds of needle valves mounted in the tray
2, the cross section of the coupling segment 41 of the needle valve
4 in FIG. 9 is circular, and the gap segment 42 comprises slots
arranged along the circumferential direction; the cross section of
the coupling segment 41 of the needle valve 4 in FIG. 10 is also
circular, and the cross section of the gap segment is circular with
shorter diameter than that of the coupling segment 41.
The working states are stated according to the flowing sequence of
water. As shown in FIG. 3, the water flow from the water system
enters the screw head 9 first, and then is divided into two ways at
this position, one of which reaches the air bag cavity from outside
of the inlet pipe 10 and then stops or returns after touching the
air bag, another of which enters the valve body 1 through the inlet
pipe 10, where it is divided into two ways, one of which is dry
way, another of which is the control branch.
The dry way: water in this way enters the fluid cavity 101 of the
inlet pipe at the inlet pipe 10, and then reaches the water stop
rubber gasket 3 in a rotating way, and a reverse water pressure to
the water stop rubber gasket 3 is generated, of which the direction
is totally opposite to the water flow in the inlet pipe 10;
The control branch: water in this way enters the internal cavity of
the filter 7 through the filter screen 8, and then passes through
the gap between the needle valve 4 and the needle valve hole 51
(shown in FIG. 6, and then reaches the back pressure cavity of the
needle valve cover 5, and then a downstream water pressure is given
to the tray 2, of which the direction is agree with the water flow
direction in the inlet pipe 10.
If the float bowl 13 is raised by the water level in the whole
water tank and reaches the closing position at this time, the float
howl controls the upper rubber gasket 12 to block the corresponding
discharge opening 121 through the adjusting rod 15, so that the
downstream water pressure in the back pressure cavity where the
needle valve cover 5 locates shares the same intensity of pressure
with the reverse water pressure in the dry way, because there is
difference that is designed between the active areas of the water
pressure of the two sides of the water stop rubber gasket 2, the
downstream water pressure is bigger than the reverse water pressure
at this time, and then the water stop rubber gasket 3 is oppressed
by the tray 2 from the outlet direction, and the water stop seat 16
is blocked by the water stop rubber gasket 3, and then water flow
is stopped from the dry way to the outlet pipe;
If the water level in the whole water tank drops at this time, the
float bowl 13 is dropped, and the discharge opening 121 is not
blocked by the upper rubber gasket 12, and then the downstream
water pressure in the back pressure cavity where the needle valve
cover 5 is reduced quickly, and no change occurs at the reverse
water pressure in the dry way, therefore the water stop rubber
gasket 3 and the tray 2 both fall back under the action of the
reverse water pressure, and then the water stop seat 16 is opened,
and then the water flow in the dry way flows down smoothly along
the pipe wall of the outlet pipe 14 in a rotating manner.
Since then after the float bowl 13 drops, water will comes out of
the outlet pipe to raise the water level of the water tank until
the closing position is reached. At this time, the discharge
opening 121 is blocked again by the upper rubber gasket 12, and the
downstream water pressure in the back pressure cavity where the
needle valve cover 5 locates starts to return: during this process,
the dry way water flow from the inlet pipe 10 passes through the
gap between the needle valve 4 and the needle valve hole 51 and
then oppresses the tray 2 to move toward the outlet direction and
squeezes the water stop rubber gasket gradually; during the above
process, the gap segment is first present between the needle valve
4 and the needle valve hole 51 with big water flow rate: when the
tray 2 keeps moving, the needle valve 4 is driven to move in the
needle valve hole 51, and the coupling segment of the needle valve
4 will enter the needle valve hole 51 gradually and replace the gap
segment, and then the water flow rate is decreased, the trend of
increasing of the downstream water pressure is remitted, and the
tray 2 compresses the water stop rubber gasket 3 slowly until the
outlet seat 16 is blocked by the water stop rubber gasket 3, the
multiple step water stop manner is determined by the
two-segment-type structure of the needle valve 4, and the shake and
noise in the valve body during the water stop process is
decreased.
Embodiment 2
Another preferred embodiment in the present invention is shown in
FIG. 11. Compared with the embodiment 1, the same points are: the
water stop device comprises the tray 2, the water stop rubber
gasket, and the relative position and function of the needle valve
4 and the back pressure cavity 51; the different points are: the
relative direction of the whole water stop device and the inlet and
outlet pipes are opposite to that of the embodiment 1, because the
end of the inlet pipe 10 is the water stop seat 16, the water stop
seat 16 approaches the water stop rubber gasket 3 and can be block
by the water stop rubber gasket 3, and the outlet pipe 14 is
connected to the outside cavity of the water stop seat 16.
Dry way: water in this way enters the fluid cavity of the inlet
pipe at the inlet pipe 10, and a reverse water pressure to the
water stop rubber gasket 3 is generated, the direction of which is
identical to the water flow direction in the inlet pipe 10;
Water in the control branch enters the filter 7 through the
passageway 102, and then enters the back pressure cavity 52 through
the needle valve 4; when the water stop rubber gasket 53 is
oppressed by the tray 2 to block the water stop seat 16 downwards,
the water in the inlet pipe 10 is shut; when the discharge opening
121 is opened to release the water pressure in the back pressure
cavity 52, the water stop rubber gasket 3 is opposed by the water
pressure of the inlet pipe 10 to raise the tray 2, and then the
water stop seat 16 is opened, so that the outlet pipe 14 is
communicated with the inlet pipe 10, water flows out (with the
opposite direction as the inlet direction of the inlet pipe), and
the needle valve 4 still moves with the tray 2 synchronously.
The invention has been described with reference to the preferred
embodiments mentioned above: therefore it cannot limit the
reference implementation of the invention. It is obvious to a
person skilled in the art that structural modification and changes
can be carried out without leaving the scope of the claims
hereinafter and the description above.
INDUSTRIAL APPLICABILITY
The valve body in the present invention divided water flow into two
ways; one way is the dry way, another way is the control branch;
water in the dry way reaches the water stop rubber gasket, and a
reverse water pressure to the water stop rubber gasket is
generated; water in the control branch passes through the gap
between the needle valve and the needle valve hole, and reaches the
back pressure cavity comprising the need valve cover, and a
downstream water pressure is given to the tray. The gap between the
needle valve and the needle valve hole is stable, so that the noise
and shake during the working process is decreased. Because the
two-segment-type structure of the needle valve, the needle valve is
provided with a damping off process in the working cycle, and then
the shock and shake caused by water stop is greatly remitted, and
the gouging abrasion and the working noise among the components are
deceased.
* * * * *